y=sin(π/4+x)×cos(π/4-x)=1/6,x∈(π/2,π),试求:cos2x和sin4x的值
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![y=sin(π/4+x)×cos(π/4-x)=1/6,x∈(π/2,π),试求:cos2x和sin4x的值](/uploads/image/z/9298397-29-7.jpg?t=y%3Dsin%28%CF%80%2F4%2Bx%29%C3%97cos%28%CF%80%2F4-x%29%3D1%2F6%2Cx%E2%88%88%28%CF%80%2F2%2C%CF%80%29%2C%E8%AF%95%E6%B1%82%3Acos2x%E5%92%8Csin4x%E7%9A%84%E5%80%BC)
y=sin(π/4+x)×cos(π/4-x)=1/6,x∈(π/2,π),试求:cos2x和sin4x的值
y=sin(π/4+x)×cos(π/4-x)=1/6,x∈(π/2,π),试求:cos2x和sin4x的值
y=sin(π/4+x)×cos(π/4-x)=1/6,x∈(π/2,π),试求:cos2x和sin4x的值
为颛顼帝高阳氏之后裔.
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